This document describes differences between the 5.8.1 release and the 5.8.2 release.

If you are upgrading from an earlier release such as 5.6.1,
first read the perl58delta,
which describes differences between 5.6.0 and 5.8.0,
and the perl581delta,
which describes differences between 5.8.0 and 5.8.1.

For threaded builds for modules calling certain re-entrant system calls,
binary compatibility was accidentally lost between 5.8.0 and 5.8.1.
Binary compatibility with 5.8.0 has been restored in 5.8.2,
which necessitates breaking compatibility with 5.8.1.
We see this as the lesser of two evils.

This will only affect people who have a threaded perl 5.8.1,
and compiled modules which use these calls,
and now attempt to run the compiled modules with 5.8.2.
The fix is to re-compile and re-install the modules using 5.8.2.

The hash randomisation introduced with 5.8.1 has been amended.
It transpired that although the implementation introduced in 5.8.1 was source compatible with 5.8.0,
it was not binary compatible in certain cases.
5.8.2 contains an improved implementation which is both source and binary compatible with both 5.8.0 and 5.8.1,
and remains robust against the form of attack which prompted the change for 5.8.1.

Starting with 5.8.3 we intend to make more frequent maintenance releases,
with a smaller number of changes in each.
The intent is to propagate bug fixes out to stable releases more rapidly and make upgrading stable releases less of an upheaval.
This should give end users more flexibility in their choice of upgrade timing,
and allow them easier assessment of the impact of upgrades.
The current plan is for code freezes as follows

If you find what you think is a bug,
you might check the articles recently posted to the comp.lang.perl.misc newsgroup and the perl bug database at http://bugs.perl.org/.
There may also be information at http://www.perl.com/,
the Perl Home Page.

If you believe you have an unreported bug,
please run the perlbug program included with your release.
Be sure to trim your bug down to a tiny but sufficient test case.
Your bug report,
along with the output of perl -V,
will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
You can browse and search the Perl 5 bugs at http://bugs.perl.org/